<u>Answer</u>: option B they have a random gene mutation that affects their fur colour.
<u>Explanation</u> :-
- <em>Variation</em> is the phenomena which occurs in all populations.
- These variations result in slight differences in the phenotypes of individuals .
- These variations only arise due to <em>random mutations </em>that arise in the individuals’ genome and then can be inherited by their offspring.
- There is always a probability of one particular trait to make the individuals survive better in the environment as compared to other trait.
- The individuals having the trait that helps them to survive better in the environment tend to survive more and leave more progeny. This is termed as <em>survival of the fittest</em>.
- Thus, according to the question it can be inferred that the dark fur colour arose due to a <em>random mutation </em>since it is the only source of variation. Since, in the given environmental conditions the mice having the dark fur colour were less susceptible to the predators they are better fitted to survive.
- The dark brown fur coat mice, survive better, leave more progeny and hence, increase their population with time. However, the orginal source of origin of this trait was a random mutation. Had this mutation not occured, the dark coloured fur mice would not have been there.
So, a <em>random gene mutation affecting the fur colour made the dark coloured mice first appear in the population.</em>
Chromosomes condense during prophase
Trauma Glasgow 7 is caused by failure to recognize and control the amount of haemorrhage. Immediate priority which nurse takes is to manage large volume of blood loss. Assessment of airway stability and patency should be performed and airway management intuited should be there as needed unless the patient is in cardiac.
Primary survey is the initial management and assessment of trauma patient. The primary purpose of the pivotal study is to treat actual and detect life threats and prevent complication from the injury. The time the patient arrives at the emergency department, full non-invasive monitoring should be applied to the patient.
The primary survey which is taken to the trauma patient include ABCDE
Airway. It is to check for any airway obstruction.
Breathing. Check for haemothorax.
Circulation. Check for circulation of blood.
Disability.
<span>Exposure</span>
Answer: C) the genes of this phage were made of DNA.
Explanation: the experiment described above wherein a radioactively labeled bacteriophage was allowed to infect bacteria ultimately led to the conclusion that the genes of the bacteriophage under study were made of DNA (a biopolymer of deoxyribonucleic acid, which is a type of nucleic acid composed of four different chemical groups, called bases: adenine, guanine, cytosine and thymine). Simply put, the experiment shows that the genetic material of the phage is DNA.
